DA2 has some good parts but there are major flaws in the game.
DKS only has graphic problems and the combat is average (due to lack of blocking ability for a game that could do with one) - apart from that, DKS is certainly a very good RPG with well laid out quests which are very detailed and the option to solve many different quests in different ways is also an adding bonus. I'm getting Divine Divinity (the previous Divinity game) for the PC soon after playing the demo and it has the same charm as the DKS.